Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3ebea61624e4eb…

MALICIOUS

PDF

75.4 KB Created: 2020-12-30 13:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7919ab01d9e81c7b161d6b6d05e2f4d1 SHA-1: 0029c4f22fa4affa79e44868376f52f2ab086984 SHA-256: 6b3ebea61624e4eb6eee84e43ee64a3416767a29c9809982ca271ee42d6c84c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The presence of a 'download button' lure and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and external links are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/strik?utm_term=blade+element+theory+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5fe0ab4f1fba5.pdfIn PDF document text
    • https://ruwawowek.weebly.com/uploads/1/3/2/7/132712040/9279265.pdfIn PDF document text
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/060613bcdb9a10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5fb3cbc8755f3.pdfIn PDF document text
    • https://xudaxeja.weebly.com/uploads/1/3/4/3/134339900/nufefimenejef.pdfIn PDF document text
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/d31d05b92a55ea.pdfIn PDF document text
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/506ed642e71663.pdfIn PDF document text
    • https://zapilututok.weebly.com/uploads/1/3/4/3/134341349/saxopunuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/22835171053.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/boguravas.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/bloons_td_6_mod_apk_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/lagujomaxuxidoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/electrical_safety_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/apriori_algorithm_ppt.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 5252 bytes
SHA-256: ad2ad8675acba0601be3580a397d14646cd4fc18cc8d1dda4cdcb0d3a262b4c8
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 12520 bytes
SHA-256: 0f7f1d0e2a48f57a9c3a5bbfbc4956bae271d1b1e5d5e0bd829e63c18afd9fa1

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